Drop-hammer.



L. P. BLOT.

DROP HAMMER.

APPLICATION FILED mums), 1908.

942,708. Patented Dec. 7, 1909.

ii I

,55% 3 5 5w; 1 1X1 TV r y 5M LUCIEN 1?. BLO'l, OF SPRINGFIELD, MASSACHUSETTS.

DROP-HAMMER.

EMZJYQS.

Specification of Letters Patent.

Patented Dec. 7, 19%).

Application filed January 29, 1908. Serial No. 413,248.

To all whom it may concern:

Be it known that I, LUCIEN P. BLor, a citizen of the United States of America, and resident of Springfield, in the county of -lampden and State of Massachusetts, have invented certain new and useful Improvements in Drop-l-lammers, of which the fol lowing is a full, clear, and exact description.

This invention relates to improvements in drop hammers of the most common and eX- tensively used kind, and the invention pertains to the construction and equipments for what is termed the friction rod and the combination of such rod with the parts of the machine with which it coacts.

The invention is illustrated in the accompanying drawings, in which,-

Figure 1 1s a front elevation of the drop hammer. Fig. 2 is an elevatlon of the hammer as seen at right angles to Fig. 1, with parts 1n section as taken on the line 22,

Fig. 1, the hammer being shown in this view raised and the parts in the positions corresponding to those shown in Fig. 1. Fig. 3 is a view similar to Fig. 2, but showing the hammer dropped with correspondingly changed positions of the friction device and the operating rod therefor. zontal cross sectional view on a larger scale as taken on line 4-a, Fig. 1. Fig. 5 is a vertical sectional view through an equip ment for the friction rod as taken on line 55, Fig. 1. Fi 6 is a sectional view showing a detail of construction hereinafter referred to. I

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings,A represents the frame of the machine having at the base thereof the anvil B; C represents the hammer sustained at the lower end of a bar a usually constituted by a plank or board, and this wooden bar is successively drawn up to lift the hammer in readiness to be dropped and then permitted to be dropped by the well known friction roll device, and means automatically actuated by the hammer for cansing the friction rolls to alternately frictionally engage or more or less pinch the hammer sustaining bar for elevatlng the hammer and then become freed from such en- Fig. 4: is a horigagement with the bar permitting the hammer to drop to the anvil, or upon the work in place to be forged thereon. T he one (Z of these rolls is mounted on the horizontal shaft f having eccentric bearings and which is geared to the shaft 9 parallel therewith, on which the roller 6 is secured, and the shaft 9 is suitably driven as by belt and pulley. The eccentrically mounted shaft for the roller cl is provided with a forwardly projecting lever arm it connected with which is the upper end of the friction rod represented by D.

Comparing Figs. 2 and 3, immediately the hammer is dropped from the elevated position shown in Fig. 2,to which it is brought by the binding action of the friction rolls 6 and (Z,the cam lug or projecion 2' on the hammer, impinging against the shoe of the friction rod, forces the latter off from the shelf or step 76 so that the weight thereof causes the downswinging of the lever h which controls the position of the eccentrically carried friction roll whereupon the friction rolls will have their nipping or frictionallybinding effect on the bar a for again elevating the hammer, and when the hammer moving from the position, Fig. 3 to that of Fig. 2 approaches the limit of its upward movement, the top of the lug or projection i will strike against a transversely offset projection 0 on the friction bar to elevate the latter, to upwardly swing the lever h, and to cause a separation of the friction rolls whereby the hammer may then be permitted to drop; and at the time of the elevation of the friction rod a horizontal bar at which is spring drawn in a rearward direction,and with the forward end of which the lower extremity of the friction rod has a sliding engagement, becomes effective to draw or slightly swing the friction rod to its rest on the shelf or step-like support 70 therefor. These arrangements and the operation thereof described in the somewhat general way as above, are as usual in hammers as heretofore constructed and commonly and extensively operated.

In the drop hammers the friction rod in the relation generally indicated in the presout drawings by the letter D has been constituted by a somewhat'massive and heavy single long forging piece, made with an intermediately located offset portion so that the upright bar is adapted to have its upper portion located in a vertical line for connection with the roller actuating lever it forward of its lower portion which is disposed closer to the frame of the machine for its engagement with the rest or stop is and the cam lug or projection at about the location indicated by 0 has been a solid clamped on iron or steel block.

The constant striking at each rising of the hammer of its projection 2' against the projection at 0 has resulted in very frequent breaking of the friction roll actuating rod D, usually below and near the location of the projection which is struck by the hammer. This has necessitated the entire re moval of the friction roll actuating rod with its equipments and the procuration of an other forged rod at the expense of delay and considerable money; and care has been required that the newly provided rod shall be exactly right as to length and also as to the extent of the offset of its lower portion relatively to its upper portion for assuring that it will be properly positioned relatively to the step is for its coaction therewith. in the course of a year the delays and expense occasioned by the breakage of this one element in the drop hammer amounts to a very large sum. Now in accordance with this invention the friction roll operating rod is made in upper and lower sections a and t which most practicably and advantageously are constituted by simple lengths of straight steel shafting, the lower one being sidewise offset from, but in a line parallel with and overlapped slightly relatively to the upper one and detachably and adjustably confined relatively to the upper one by the clamp block a so that the adjustment of the lower rod section is both longitudinally relatively to the upper one and also partially revolubly to the end that the lower extremity of the rod is always at the right height with relation to the step or rest and is always located in the region of such step irrespective of variations in the position thereof in various machines.

The lower rod section 2/ is provided with its transversely projecting member 0 constructed as particularly shown in Figs. 4' and 5 with a downwardly opening socket o having therein a downwardly protruding contact member 10 which is composed of wood, the same practicably having a driving fit in the said socket member. The said member 0 is made with a vertical cylindrical perforation for the passage of the rod section 2, therethrough, and is split at one side of the per l I l foration and extended in ear lugs 3 3 which are constricted by the bolt 8 and nut s thereon, The provision of this block of wood 10 for receiving the many times repeat-ed forcible contacts thereagainst of the rising hammer is effective for prolonging the life of the lower rod section 25 many times that which was formerly the case, and even when a rod section becomes broken it is a most simple expedient to procure the required simple length of straight shafting for its replacement which, as manifest, may be mostexpeditiously and inexpensively done.

As represented in Fig. 6, the lower section if comprised in the friction roll operating rod is provided very near its lower end (which end at times has supporting contact on the step is and at other times has its position below such step) with a transverse tapered hole in which is provided, with a driving fit, a tapered hardened steel pin 2 which has the effect in practical operation of preventing the lower striking end of the rod from becoming battered and mashed.

lVithin a comparatively short time after therod equipped as just described at its lower end shall have been put into use in the drop hammer, the slight lower end portion of the rod below the hardened pin will be come worn away or more or less distorted from its original condition so that it is the hardened pin itself which has the contacting or striking action against the step shaped machine frame.

I claim 1. T he combination with the hammer and the friction roll positioning lever, of a controlling rod for said lever consisting of two straight sections, the upper one thereof being pivoted to and depending vertically below the lever and having a clamp block detachably secured to, and revolubly adjustable at its lower extremity, while the lower straight section endwise overlaps the lower extremity of the upper section and is confined in said clamp block and is provided at an intermediate portion thereof with a laterally extending abutment to be contacted against by the hammer, said lower rod section being vertically adjustable relatively to the upper section and also, because of the character of said clamp block, revolubly adjustable relatively to said upper section.

2. The combination with the hammer, and the friction roll positioning lever, of a controlling rod for said lever pivotally hung to the latter, having a socketed block adjustably clamped on an intermediate portion thereof outside of the vertical line of the rod, and which block is provided with a downwardly opening socket having a solid top closing wall, and a contact member composed of a body of wood fitted in said socket and downwardly protruding below the bottom of I having near its lower end a transverse tapered 10 the block, for receiving the abutment therei hole with a hardened tapered pin in place against of the rising hammer. therein.

3. The combination with the hammer and Signed by me at Springfield, Mass, in the friction roll positioning lever, of a fricl presence of two subscribing witnesses.

tion roll controlling rod hung to the lever LUClEN P. BLOT. and made in two sections removably con- Witnesses: nected, and the one adjustable relatively to l/VM. S. BnLLows,

the other, and the lower one of said sections 1 G. R. DRISCOLL. 

